In 2007, Qiao Xue of Jilin University's master's degree thesis "The Fish King from the Perspective of Eco-feminism" took the perspective of eco-feminist literary criticism as the narrative theme, and used corresponding research methods to discuss the Fish King from the perspectives of "gender" and "environment", and analyzed the mutual tolerance of literature, philosophy, nature, women and culture in the works, thus broadening the understanding from the perspective of studying female eco-literature.

In 2008, Yao of Inner Mongolia Normal University wrote his master's degree thesis "Human Mind, Spiritual Nature —— On the Fish King's Call for Harmonious Relationship between Man and Nature", which discussed the relationship between man and nature from the height of humanity and morality, and punished evil and promoted good. "Fish King" is a symbol of spiritual and natural strength. A Shi's creative personality is distinct. His works show the beauty of nature incisively and vividly, and endow all things in nature with spirituality. The purpose is to hope that human beings can straighten their own position, straighten the relationship between man and nature, and understand the vastness and power of nature.

20 1 1 The book ввдегтярёва published by a female scholar in Krasnoyarsk, Russia, is worth reading. This book mainly tells the mythical images in Russian and American natural philosophy novels. The novel mainly compares the mythical images of water in Astafyev's The Fish King, Moby Dick in Melville, and Hemingway's The Old Man and the Sea. The book is divided into preface, the first part "myth perspective", the second part "myth in water", the third part "myth about fish and whales" and conclusion.

20 13 the ecological ethics theme in Astafyev's works, a master's thesis by Wang Dan of Liaoning university, mainly demonstrates the influencing factors of Astafyev's ecological ethics theme creation, and discusses the continuous exploration and sublimation of the ecological ethics theme in his natural philosophy novels by comparing the similar achievements of other contemporary writers. His inner world bears profound thoughts on the future destiny of mankind.

20 13 The Fish King in the View of Ecological Criticism, a master's thesis of Liu Juan, Xinjiang University, uses three ecological criticism methods: ecological ethics, ecological holism and ecological eschatology, which profoundly demonstrates the ecological consciousness and ecological humanistic care of the Fish King and inspires the development process of human spirit.